CN201576317U - Video type vehicle traveling data recorder - Google Patents

Abstract

The utility model discloses a video type vehicle traveling data recorder, relates to an vehicle traveling data recording system, and provides an improved video type automobile running recorder. The video type vehicle traveling data recorder is provided with an inner core processing module, a data acquisition module, a data storage module, a man-machine interaction module and a system interface module. The inner core processing module comprises an ARM processor and a DSP chip dual-core structure, the data acquisition module comprises a CAN bus module and an audio and video acquisition module, the data storage module comprises a storage peripheral of an ARM sub system, a storage peripheral of a DSP sub system and a CF card carried by the system, the man-machine interaction module comprises a display screen, a touch screen and a printer, and the system interface module comprises a serial port, a network port and a USB interface. Video information processing corresponding to 4CIF (360*288) sequences can basically meet real-time requirements, and can realize functions of a rearview mirror. Audio information processing is subject to a uniform clock so as to lead audio and video streams to be synchronous. The CF card for data storage is small in volume, low in power consumption, fast in speed, fine in adaptability and long in service life.

Description

Video formula automobile travel recorder

Technical field

The utility model relates to a kind of pilot recording system of automobile, relates in particular to a kind of video formula automobile travel recorder.

Background technology

At present along with the becoming stronger day by day of China, the people's living standard has also had significant growth.Automobile no longer has been luxury goods, but a kind of walking-replacing tool.The vehicle that is accompanied by on the highway is increasing, and traffic hazard is also more and more, has caused tremendous loss for the people and country.In order to reduce traffic hazard, and can make things convenient for and correctly handle traffic hazard, it is more and more important that automobile travel recorder seems.This series products of developed countries has obtained popularizing widely.

Traditional automobile travel recorder is mainly finished the record and the processing of automobile speed, time and brake situation, and the major function that is realized has: collection, record, the storage of real-time clock, date and the time of driving; The measurement of vehicle running state, speed, record, storage; Prevent fatigue driving; Data communication etc.

HB-R02 standard form registering instrument with Shenzhen China precious electronics technology company limited is that example is done an explanation below.This registering instrument mainly comprises kernel processes module, data acquisition module, data memory module, human-computer interaction module and system interface module etc.Be connected on the CPU of kernel processes module by data bus and input/output interface between these modules, by software they carried out despatching work again.

The kernel processes module mainly is made up of two parts: processor CPU and correspondent peripheral circuit.Peripheral circuit internally links to each other with CPU, externally links to each other with each functional module, under the scheduling of software, drives each functional module and carries out work.CPU then is responsible for the data in the course of work are dealt with the work.

Data acquisition module mainly is made up of the CAN bus module, links to each other by CAN bus direct and on the automobile, can obtain automobile various forms parameter in the process of moving easily, such as the speed of a motor vehicle, door contact interrupter and brake information etc.

Data memory module mainly is made up of SDRAM (Synchronous Dynamic Random Access Memory, Synchronous Dynamic Random Access Memory), FLASH storer (FLASH memory) and the USB flash disk of system.The SDRAM of system and FLASH are used for the interim storage of some data of the program of storage system and collection.USB flash disk is used to store some information of some important characteristic parameters (such as the speed of a motor vehicle and revolution etc.) and the driver and the automobile itself of Tachographs automobile in the process of moving.

Human-computer interaction module is made up of LCDs, button, printer (peripheral hardware) etc.LCD also can show the parameter of some automobiles in the vehicle ' process, as the speed of a motor vehicle and distance travelled etc., show driver's identity and real-time time (date Hour Minute Second) in addition.Button can select to check driver's some running datas before, also can connect the universal serial port printer prints to some running datas by specific button and come out.

System interface module mainly is made up of serial ports and USB interface.Serial ports is used for the printing of data and to the setting of some special parameters of system.USB interface is used to discern specific USB flash disk, carries out driver's authentication and stores this driver some automobile parameters in the process of moving and the environmental information of the doubtful point of accident.

This system stores the speed of a motor vehicle of the doubtful accident point in the vehicle traveling process and the signal of bringing to a halt, at the automobile video registering instrument in modern times except having above-mentioned functions, also need the information of vehicle and near the environmental information the accident origination point are noted with the intuitive manner of video and audio frequency.Like this, video recorder can be used for the picture record of vehicle's surroundings the driver and monitor road surface and surrounding environment, the data of absorbing can be write down again to be used for investigating and collecting evidence after the accident.This will make things convenient for the driver greatly, reduce traffic hazard, and handle for accident generation " Invest, Then Investigate " true accurately and reliably foundation is provided.

Summary of the invention

The purpose of this utility model is to have only the simple numerical record in order to overcome the traditional record instrument, can not accurately know the deficiencies such as reason that the description accident produces, and a kind of improved video formula automobile travel recorder is provided.

The utility model is provided with:

Kernel processes module, kernel processes module comprise arm processor and dsp chip double-core framework, and DSP is used for video acquisition, storage and playback; Arm processor is used for liquid crystal display, touch screen query, digital/analog signal collection and printing etc., and arm processor and dsp chip are by HPI interface swap data;

Data acquisition module, data acquisition module comprises CAN bus module and audio-video collection module, be used for by being installed at video frequency pick-up head on the automobile and the microphone of Che Nei, gather in the headstock, car of driving vehicle, the video pictures of the tailstock and the voice data of Che Nei;

Data memory module, data memory module comprises the storage peripheral hardware of ARM subsystem, the storage peripheral hardware of DSP subsystem and the CF card of system's band, the storage peripheral hardware of ARM subsystem is used to store the linux kernel and the file system of ARM system, and the program code of the operation interface of man-machine interactive system etc., the storage peripheral hardware of DSP subsystem is used to store the storage of DSP to the compression algorithm of audio-video collection, and the CF card of system's band is used for audio, video data and the running data of vehicle and some information of driver and automobile itself of the doubtful point of storage accident;

Human-computer interaction module, human-computer interaction module comprises display screen, touch-screen, printer (peripheral hardware) etc., touch-screen is as the input equipment of man-machine interaction, display screen is used to show the parameter of various automobiles such as the speed of a motor vehicle, distance travelled, vehicle interior temperature and running time of the date Hour Minute Second that travels, driver's identity, vehicle ', the real-time video of camera be can directly check by the control of touch-screen, also can former video and form data be checked with touch-screen;

System interface module, system interface module comprise serial ports, network interface and USB interface, and serial ports is used for the setting and the printer communication of update system, and USB interface can be passed through USB flash disk, and all audio, video datas of copy system stored make things convenient for the evidence obtaining investigation of law enforcement agency.

The storage peripheral hardware of described DSP subsystem comprises FLASH and SDRAM etc.

Compared with prior art, the utlity model has following outstanding advantage and technique effect:

1) video information process: the utility model adopts H.264 advanced video coding compression algorithm, and to D1 (720 * 576) sequence, under the middle motion, per minute 25 frames of encoding substantially are so can reach real-time requirement substantially corresponding to 4CIF (360 * 288) sequence.Since native system three road video acquisitions to video data be the CIF sequence, so algorithm satisfies system's real-time coding requirement, its compressibility is subjected to the influence of object of which movement amount in video quality grade and the video for dynamic, between 80～300 times.Streaming Media after the compression is put among the SDRAM earlier temporarily, arrives a certain amount of or during the accident generation, property writes in the CF card again.

In addition, for the ease of the situation that the driver observes vehicle body in real time by display, be convenient to driving, reversing, parking etc.System can directly send a certain road video in 3 road videos into the display real-time play by driver's requirement and come out, thus functions such as realization rearview mirror.

2) audio-frequency information is handled: after sound signal is gathered, carry out G.722 encoding compression processing, this algorithm is video conference audio-frequency signal coding/coding standards that ITU-T recommends, and data transfer rate is 64K b/S, adopts the 16K sampling rate, and audio signal bandwidth is 7KHz.G.722 be sub-band adaptive pulse code modulation (PCM) agreement (SUBBANDADPCM), in general, 32 sampling linear code is 8 after G.722 compressing, and the utility model adopts G.722-48K pattern, and its decoded sound effect is equivalent to the tonequality of FM receiver.Voice data after the compression is put among the SDRAM temporarily, reaches a certain amount of or accident when taking place, and just is saved in the CF card.System is as the criterion with unified clock, makes audio/video flow reach synchronous.

3) data storage: the utility model adopts high capacity CF card to preserve data.The advantage of CF card is: volume is little, low in energy consumption, speed is fast, adaptability is good.In native system, related data is stored in earlier among the SDRAM, when reaching certain amount or accident and triggering, just with data conversion storage in the CF card.Reduce the read-write number of times of CF card like this, increased the serviceable life of CF card.

4) System self-test function: the utility model is after system energising, and the main hardware of detection system part operate as normal whether at first one by one, and can being presented at the result who detects on the display of system allows the user come into plain view.

5) driver identity recognition function: the utility model must carry out identification to the driver after system opens, the driver who only has mandate just can enter system and steering vehicle, also can't drive a car otherwise can't enter system.Strengthened the anti-theft feature of automobile.

6) running data memory function: the utility model can be to the parameter of travelling of automobile, as the speed of a motor vehicle, distance travelled, running time etc. in the process of running car; Vehicle various status informations under steam, as brake, blow a whistle, rain brush, steering indicating light etc.; Around the running car and the audio, video data of internal environment carry out effectively monitoring in real time, and store accordingly.Particularly having an accident doubtful some the time vehicle ' numerical parameter and the car brakeing status signal of 20s real-time time correspondence this registering instrument will continue record and storage and stop with the time interval that is not more than 0.2s before; And video and the voice data of meeting recording storage accident doubtful front and back 30s.

7) safe driving function: the safe driving function mainly comprises two aspects, is respectively to prevent fatigue driving and anti-furious driving.Drive continuously and surpass 3h when same driver is uninterrupted, just be regarded as fatigue driving, this moment and system will send the voice alarm prompting driver rest of stopping.Surpass the vehicle-speed limit of setting as the continuous 10min of average speed after, system will send voice alarm, and the prompting excessive velocities needs to slow down and goes slowly.

8) power-off protection function: when this registering instrument cuts off the power supply, enter guard mode automatically, the data of storage can be preserved and do not lost in 3 months before the outage.

9) data output function: can provide 4 kinds of modes that the data of storage are exported.The 1st kind is that direct touch-screen man-machine interaction software by system directly is presented on the LCD, can make driver or law enfrocement official that the travel conditions of conveniently checking vehicle is arranged.The 2nd kind is directly can directly print the digital parameters of vehicle by microprinting, makes things convenient for law enforcement agency's evidence obtaining like this.The 3rd kind then is directly to use the USB flash disk copy by USB interface.The 4th kind then is that system can't work after major accident takes place, and the CF card of the internal system of can directly choosing directly just can be checked corresponding data by host computer.

The utility model has improved the driving safety and the theftproof performance of automobile.Simultaneously, this registering instrument can be discerned automatically and judge doubtful accident point, take place as the doubtful point of accident, the running car basic parameter of a period of time and the audio frequency and video of surrounding environment thereof before and after the record accident is doubtful provide reliable scientific basis for analyzing, judge vehicle driving condition and handling traffic hazard.

Description of drawings

Fig. 1 is the composition frame chart of the utility model embodiment.

Fig. 2 is the circuit theory diagrams of the arm processor in the kernel processes module of the utility model embodiment and the circuit theory diagrams of corresponding memory module.

Fig. 3 is the circuit theory diagrams of the dsp processor in the kernel processes module of the utility model embodiment and the circuit theory diagrams of corresponding memory module.

Fig. 4 is connected the schematic diagram that carries out communication for the arm processor in the kernel processes module of the utility model embodiment with dsp processor by HPI.

Fig. 5 is the video data acquiring circuit theory diagrams.

Fig. 6 is an audio frequency audio data Acquisition Circuit schematic diagram.

Fig. 7 is the circuit theory diagrams of the system interface module of the utility model embodiment.

Embodiment

The utility model will be further described below in conjunction with accompanying drawing.

Referring to Fig. 1, the utility model embodiment is provided with kernel processes module 1, data acquisition module 2, data memory module 3, human-computer interaction module 4 and system interface module 5.Kernel processes module 1 comprises ARM9 processor (S3C2440A type), dsp processor (DM642 type) and correspondent peripheral circuit.Data acquisition module 2 mainly is made up of CAN bus module and audio-video collection module, the CAN bus module is responsible for gathering 2 tunnel simulating signals 21 and the 14 way word signals 22 of automobile, and the audio-video collection module is made up of video decoding chip 23, audio decoder chip 24, camera 25 and microphone 26.Data memory module 3 mainly is made up of the SDRAM chip 31, FLASH chip 32 and the external Compact Flash 33 that are connected on the kernel processes module.Human-computer interaction module 4 is made up of functional modules such as the monitor 44 of touch-screen 41, display output 42, mini-printer 43, video output usefulness, voice-output devices (as: loudspeaker) 45.The interface module 5 of system comprises serial ports 51, network interface 52 and USB interface 53 compositions on the native system main frame.

Fig. 2 provides the circuit theory diagrams of the arm processor in the kernel processes module of the utility model embodiment and the circuit theory diagrams of corresponding memory module.

Have 3 class chip: processor chips U1, SDRAM chip U2, flash chip U3 and U4 among the figure.

S3C2440 inside mainly comprises with the lower part: address wire ADD, data line DATA, chip selection signal Chip Select, digital-to-analog conversion line ADC, clock signal C lock, timer Timer and data channel DMA, these signal wires are connected with peripheral circuit again, to realize whole functional.

Chip U2, U3, U4 are mainly by address wire ADDR[], data line DATA[], write signal WE, reset signal RST, clock signal clk form.And with master chip U1 according to the diagram is connected, the realization to functions such as data write.

Fig. 3 is the circuit theory diagrams of the dsp processor in the kernel processes module of the utility model embodiment and the circuit theory diagrams of corresponding memory module.

Comprise processor chips U5, SDRAM chip U2, flash chip U6 among the figure, processor controls chip U5 mainly comprises with the lower part: address wire ADD, data line DATA, chip selection signal Chip Select, digital-to-analog conversion line ADC, clock signal C lock, timer Timer and external interrupt EXINT, these signal wires are connected with peripheral circuit again, to realize whole functional.

TMS320DM642-600A (U5B): mainly be to link to each other with address wire EA with the data line ED of U2.

TMS320DM642-600A (U5A): mainly draw jtag interface, reset signal, external interrupt signal and clock signal.

TMS320DM642-600A (U5G): the bus signals link to each other with U7 (IIC_SEL) of control coding chip.

U2, U6 are the storage chips of the memory module that is connected with dsp processor.

HY57V283220T (U2): as SDRAM, the gentle poke word video/audio data of the program of depositing, DM642 can handle 64 data simultaneously, so can be so that two 4M*32 position SDRAM work simultaneously.

AM29LV033C (U6): as FLASH, deposit program curing, so that carry out rom boot, the bootstrapping of realization program is controlled by CPLD.

SN74CBT3257 (U7): SCL1, SDA1 among SCL0, SCL1, SDA0, SDA1 and the X1226S among the used coding chip TVP5150 of four road videos all need the clock line SCL of the DM642 of U7 to link to each other with data line, use U39 can utilize the time interval of streamline to select to link to each other, control is then by iic bus.

The arm processor that Fig. 4 provides in the kernel processes module of the utility model embodiment is connected the schematic diagram that carries out communication with dsp processor by HPI.

Main two parts that divide among Fig. 4, a part is a host machine part S3C2440 part just, another part is the slave part, i.e. the DSP part.The principle of work of HPI is exactly by following connected mode, can be so that the part SDRAM of DSP part is visible for arm processor.That is to say that arm processor can directly control the part SDRAM in the DSP subsystem.And then the high-speed transfer that can realize the data between ARM part and the DSP part is mutual.

Data[15:0] be 16 data line.Addr2-Addr5 is that the address wire of ARM writes 0 or write 1 by many its, and then realizes the control to hpi.LnWE, LnOE are read-write; LnGCS2 is a chip selection signal, selects the mapping memory block of arm processor; ENT17 is an external interrupt signal; NWAIT is a waiting signal.

HCNTL0, HCNTL1 are address or control signal wire, and two pins are determined certain register of host access HPI.

HR/-W is the read/write gating signal, for high, is written as low when main frame is read HPI.

HHWL is address or control signal wire, and half-word is distinguished signal, and what 0 representative was transmitted is first half-word, and 1 is second half-word.

HDS1, HDS2 are that the state latch auxiliary signal latchs each control signal with HCS.

HCS is address or control signal wire, chip selection signal.

-HAS is an address gating signal or need not.Here directly be changed to a high position.

-HINT is connected with ENT17, and HPI is to the main frame look-at-me.

HREADY is connected with the nWait signal, HPI reading and writing data standby ready signal.

Fig. 5 provides the video data acquiring circuit theory diagrams.

TVP5150_BPS (U19, U20, U21): as video decoding chip, by the SCL0 on the iic bus, SDA0, pairing four tunnel video channels work of four chips of SCL1, SDA1 control, select total line traffic control by alternative chip SN74CBT3257 (U39), PAL/NTSC composite video CVBS or component vide Y/C analog video that it is input as standard are output as 8 BT.656 digital video data streams of standard.

The utility model uses 3 road video acquisitions altogether, and its principle is identical, only draws one the tunnel among Fig. 6, is used for signal.By the tvp5150_BPS modulus conversion chip analog video signal of being gathered is converted to digital signal and is transferred to dsp processor again and handles various algorithms such as compression, at last again by the D/A converting circuit reproducing of video.

What the utility model used is ARM+DSP double-core system, so ARM subsystem in the system and DSP subsystem are not only separate but also connect each other.The ARM subsystem is exactly that coordination allotment work and man-machine interaction to total system realizes corresponding operational order as the host machine part major function of native system.The DSP subsystem is as a slave part, and main being responsible for stored this critical function to the collection and the compression of audio frequency and video.

Fig. 6 provides the audio data collecting circuit theory diagrams.

The audio-frequency module principle of work, the function that plays in system is used following explanation in conjunction with pin:

AP_BCLK is digital audio interface clock signal (a bit clock), and when AIC23 is (normal conditions) during from pattern, this clock is produced by DSP; When AIC23 was holotype, this clock was produced by AIC23; AP_LRCIN is the frame signal (word clock under the I2S pattern) of digital audio interface DAC direction; AP_LRCOUT is the frame signal of digital audio interface ADC direction;

AP_DIN is the data input of digital audio interface DAC direction; AP_DOUT is the data output of digital audio interface ADC direction; SCL0 and SDA0 are the internal register that DSP passes through this part configuration AIC23, and the preceding 7bit of each word is a register address, and back 9bit is a content of registers.Be used for accepting the DSP control strip and select function; AP0_LINEIN is left and right acoustic channels LINE IN input; AP0_LINEOUTL and AP0_LINEOUTL are left and right acoustic channels LINEOUT output; AP_MCLK is the input of chip clock; AP0_VMID is half pressure input, usually by being a 10U and a 0.1U electric capacity ground connection in parallel; MODE is the chip operation model selection, Master or Slave; CS is chip selection signal (effectively low during configuration); The J3 wire jumper can be controlled the selection of LINE and MIC pattern;

Fig. 7 provides the circuit theory diagrams of the system interface module of the utility model embodiment.

DM9000 (U10) is the master chip of network interface, by the LnWE on the chip, LnOE read-write native system is carried out data interaction, is mainly used in the file renewal of system etc.MAX3232SOP (U11) is the R232 serial port chip, and RSTXD is a read signal, and RERXD is a write signal.Serial ports can synchronous display system some information and can print related data by external mini-printer.Third part is the usb host interface, can external USB flash disk etc., realize USB flash disk is carried out corresponding file operation by software.

Below provide the system works flow process of the utility model embodiment.

System is in case after the energising startup, will move according to this flow chart loops, till automobile flameout stops native system.

After system energising, the self-checking function of executive system at first, whether the hardware device that detects total system can operate as normal.Be exactly to enter native system after self check is finished, native system is provided with identity recognition function, has only authorized driver to use the ID card just can enter native system.After entering native system, system just begins operate as normal, and the work of system realizes with ARM and two subsystem concurrent workings of DSP.The DSP subsystem just begins to gather audio, video data later on entering system, and be presented on the display in straight-through mode, send the middle note of a doubtful point of accident when main frame after, DSP responds, and beginning is stored tens seconds time of doubtful front and back on the CF card into.The ARM subsystem powers at chair and has just started working, System self-test is also realized under the ARM system, after authentication enters system master interface, the ARM subsystem begins to gather automobile speed and the system parameter of travelling accordingly by time interval of 0.2s, and can show a series of parameters of travelling such as average speed, distance travelled, running time on the display of operation interface.And by equipment such as acceleration transducers, identification has judged whether that the doubtful point of accident takes place automatically, the doubtful point of the busy event of a point discovery, and this is the parameter of travelling of store car on the one hand, and sending look-at-me makes its stored video signal to DSP on the one hand.What use in operating system is touch-screen, and more corresponding function buttons are set in screen, is that the driver can carry out some shirtsleeve operations to native system by button.To realize data readback, the camera conversion shows, the usb data transmission, and data such as suppress at functional requirement.

Above technical scheme has realized a kind of high-performance, high reliability and practical new automobile Tachographs, particularly can rebuild the environmental information of vehicle ' effectively by the video storage mode, for the use at automotive field wide prospect is arranged.

The utility model not only possesses traditional record instrument function, and the audio, video data of the doubtful front and back of accident in the vehicle traveling process is carried out record, provides more reliable true foundation for handle afterwards.The video capability of system also can make things convenient for the driver observation road conditions, like rain the greasy weather by native system exclusive go the misty rain Processing Algorithm, can increase driver's visibility limit.

The utility model is paid attention to the function of audio frequency and video aspect more.Except that gathering general driving parameter, also before and after the record accident doubtful point, multi-channel video information and audio-frequency information before the car, behind the car, in the car because the field scene before and after can the playback accident, when accident treatment than the more convincing and confidence level of record of traditional record instrument.Adopt the double-core mode of ARM9 processor+dsp processor to make up video recording device (ARM:Advanced RISC Machines, DSP:Digital Signal Processing digital signal processing).Dsp processor is absorbed in video information process, and the ARM9 processor is responsible for other driving parameter acquisition and various Control work, and Each performs its own functions and intercom mutually by HPI (Host-Port Interface) host interface for two modules.Use the powerful expanded function of ARM embedded system, can also select gps (GPS) in the product afterwards for use, gprs (general packet radio service technology, General Packet Radio Service), modules such as wireless transmission.

The reference model of main devices is as shown in table 1.

Table 1

Numbering	The chip model	Numbering	The chip model
				U1	S3C2440A	U7	SN74CBT3257
U2	HY57V283220T	U8	tvp5150_BPS
				U3	SST39VF1601	U9	TLV320AIC23BPW
U4	K9F1208	U10	DM9000
				U5	TMS320DM642-600A	U11	MAX3232SOP
U6	AM29LV033C

Claims (2)

1. video formula automobile travel recorder is characterized in that being provided with:

Kernel processes module, kernel processes module comprise arm processor and dsp chip double-core framework, and DSP is used for video acquisition, storage and playback; Arm processor is used for liquid crystal display, touch screen query, digital/analog signal collection and printing, and arm processor and dsp chip are by HPI interface swap data;

Data acquisition module, data acquisition module comprises CAN bus module and audio-video collection module, be used for by being installed at video frequency pick-up head on the automobile and the microphone of Che Nei, gather in the headstock, car of driving vehicle, the video pictures of the tailstock and the voice data of Che Nei;

Data memory module, data memory module comprises the storage peripheral hardware of ARM subsystem, the storage peripheral hardware of DSP subsystem and the CF card of system's band, the storage peripheral hardware of ARM subsystem is used to store the linux kernel and the file system of ARM system, and the program code of the operation interface of man-machine interactive system, the storage peripheral hardware of DSP subsystem is used to store the storage of DSP to the compression algorithm of audio-video collection, and the CF card of system's band is used for audio, video data and the running data of vehicle and some information of driver and automobile itself of the doubtful point of storage accident;

Human-computer interaction module, human-computer interaction module comprises display screen, touch-screen, printer, touch-screen is as the input equipment of man-machine interaction, and display screen is used to show the date Hour Minute Second that travels, driver's identity, the speed of a motor vehicle, distance travelled, vehicle interior temperature and the running time of vehicle ';

System interface module, system interface module comprise serial ports, network interface and USB interface, and serial ports is used for the setting and the printer communication of update system, and USB interface is by USB flash disk, all audio, video datas of copy system stored.

2. video formula automobile travel recorder as claimed in claim 1 is characterized in that the storage peripheral hardware of described DSP subsystem comprises FLASH and SDRAM.

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